Acid Reducers, also called antacids are alkaline drugs that are responsible for reducing the amount of acids in the stomach. It prevents and treats heartburn in your stomach. It is also used to treat gastroesophageal reflux disease(GERD). Acid Reducers are used to treat ulcers, help avoid problems in people who are at the risk for ulcers, like those who take NSAIDs, treat gastroesophageal reflux disease(GERD).